John Deere — Install Cylinder Head (Two-Valve Head Engines)
Repair & overhaul
From a John Deere service manual covering: 4045, 4045TF120, 6068, 6068 HF485, 6068HF158, 6068TF120, 6068TF250, 6068TFM50, 6068TFM76. Check it applies to your exact model before use.
Applies to: John Deere 4045, John Deere 4045TF120, John Deere 6068, John Deere 6068 HF485, John Deere 6068TF120, John Deere 6068TF250, John Deere 6068TFM50, John Deere 6068TFM76
Before you start
- Always use new cylinder head cap screws
- Head gasket can be damaged if head is repositioned on block
Procedure
- Dip fuel supply pump push rod in clean engine oil and install.
- Reinstall two dowel pins in cylinder block.
- Place new head gasket on block dry (no sealant).
- Position cylinder head over guide studs and lower onto block.
- Dip entire cap screw in JDT305 Lubricant.
- Remove guide studs and install new flanged-head cap screws.
- Tighten in sequence Step 1 (100 N•m), Step 2 (150 N•m), Step 3 verify (150 N•m).
- Torque-turn each screw an additional 60° ± 10°.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Step 1 100 N•m (75 lb-ft)
- Step 2 150 N•m (110 lb-ft)
- Step 4 torque-turn 60° ± 10°
Full service-parts list: John Deere 4045 →, John Deere 6068 →, John Deere 6068 HF485 →, John Deere 6068TF250 →, John Deere 6068TFM50 →, John Deere 6068TFM76 →
Source: John Deere service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.